At first I thought that this staff just sucked at making in game adjustments. Then I saw that the staff uses the same schemes from game to game with little to no adjustment. This is not a team that gameplans. They don't scout out an opponent's vulnerabilities and try to exploit them. Tuiaki lucked out against USC because his vanilla defense worked against USC's offense. I hate to sound like I'm quoting Whittingham, but Sitake and Tuiaki did nothing special to stop USC. They didn't sceme against them and try to exploit them. They lucked into the right defensive set for that game.
BYU is losing games because of their inability to game plan, and make adjustments to their scheme in game and week to week. Opposing teams know exactly what BYU's going to do, and prepare accordingly.
Sitake and his staff have no idea how to fix the problem, even if they are able to identify it. I'm not even sure they can do that, cause every week it's more of the same "I'll need to watch film to see where we went wrong".
BYU needs to clean house and start over. Sitake just can't get it done.